Question 1

Which layer of the skin is primarily responsible for synthesizing vitamin D when exposed to sunlight, and why is this function important for the body?

Accepted Answer

The epidermis; it is important for calcium absorption in the intestine.

Question 2

A patient presents with pale, bluish skin coloration (cyanosis). Which of the following best explains the physiological basis for this observation?

Accepted Answer

Low oxygenation of hemoglobin in the blood.

Question 3

Which of the following best describes the structural difference between the epidermis and the dermis?

Accepted Answer

The epidermis is avascular and made of stratified squamous epithelium, while the dermis is vascular and made of fibrous connective tissue.

Question 4

Which of the following glands is responsible for producing a secretion that helps prevent bacterial growth on the skin?

Accepted Answer

Sebaceous glands, which secrete sebum containing defensins.

Question 5

A surgeon makes an incision parallel to the cleavage lines in the reticular layer of the dermis. What is the expected outcome compared to an incision made perpendicular to these lines?

Accepted Answer

The incision will heal more readily and leave a smaller scar.

Question 6

Which of the following best explains why the stratum corneum is effective at preventing water loss from the body?

Accepted Answer

It is composed of dead, keratinized cells and glycolipids that block most water and water-soluble substances.

Question 7

A patient is experiencing excessive sweating during exercise. Which physiological mechanism is responsible for this response?

Accepted Answer

Dilation of dermal blood vessels and activation of eccrine sweat glands to increase sweat production.

Question 8

Which of the following is a function of the hypodermis?

Accepted Answer

Absorbing shock and insulating the body.

Question 9

Which of the following best describes the role of melanocytes in the skin?

Accepted Answer

They produce melanin to protect against UV radiation.

Question 10

A patient presents with yellow nails. Which underlying condition might this finding suggest?

Accepted Answer

Fungal infection.

Question 11

Which of the following is true regarding the blood reservoir function of the skin?

Accepted Answer

The skin can hold up to 5% of the body's total blood volume and can constrict to shunt blood to other organs.

Question 12

Which type of sweat gland is most numerous and plays a key role in thermoregulation?

Accepted Answer

Eccrine (merocrine) sweat glands.

Question 13

Which of the following best explains why incisions made perpendicular to dermal cleavage lines tend to heal poorly?

Accepted Answer

They disrupt collagen fibers, causing more tension and slower healing.

Question 14

Which of the following is a function of the skin as an organ system?

Accepted Answer

Excretion of nitrogenous wastes such as ammonia, urea, and uric acid.

Question 15

A patient with uncontrolled diabetes develops horizontal lines across their nails. What is the most likely explanation for this finding?

Accepted Answer

Severe illness such as uncontrolled diabetes or heart attack.

Question 16

Which of the following best describes the function of the arrector pili muscle?

Accepted Answer

It contracts to cause 'goose bumps' by raising the hair.

Question 17

Which of the following is a correct statement about the structure of nails?

Accepted Answer

Nails are composed of hard keratin and cover the distal, dorsal surface of fingers and toes.

Question 18

Which of the following is a function of the reticular layer of the dermis?

Accepted Answer

Provides stretch-recoil properties and strength to the skin.

Question 19

Which of the following best describes the secretion of apocrine sweat glands?

Accepted Answer

Viscous, milky or yellowish sweat containing fatty substances and proteins.

Question 20

A patient presents with 'spoon nails' (outward curvature of the nail). Which underlying condition might this finding suggest?

Accepted Answer

Iron deficiency.

Chapter 5: The Integumentary System – Structure, Function, and Components

Guida di studio - Domande di pratica

Study guide - Flashcard